Chart drive regulator



sept 10, 1940 R. R. CHAPPELL ET A1.v

CHART DRIVE REGULATDR 4 Sheets-Sheet l Filed June 1, 1939 df ,2m www. J

.TMR f am Wmd.. EGE of Sept. 10, 1940. in. R. cHAPPl-:LL E r AL 2,24522' v`lc'zHART DRIVE REGULATOR Filed June`1, 1959 @sheets-sheet 2 Sept. l0, 1940.

R. R. cHAPPx-:LL :r AL

cHART DRIVE REGULATOR Filed Junel 1,v 1939.' 4 Sheets-Sheet 3 Sept. l0, 1940. R. cHAPPl-:LL sr A1.

CHART DRIVE REGULATOR- Filed June 1, 15539- 4 sheets-sheet `4 a 6,7 0// .h v mvw www m www A vnvn y! Patented Sept. 10, 1940 anaszz rATsNT ortica CHARTE DRIVE REGULATOR Ralph R. Chappell, Richmond, Va., and Rutger B.

Colt, Baltimore, Md., assignors to Bendix Aviation Corporation, South Bend, End., a corporation of Delaware Application June 1, 1939, Serial No. 276,9ll8

15 Claims.

The present invention relates to recording devices and more particularly to novel means for driving one of the elements of such devices.

The invention embodies a novel combination 5 of a heavy weight or other powerful driving element for driving `a recording element at fairly high speed, and novel retarding and timing mechanism whereby overbanking of the timing ele'l ment is eliminated and greater precision of re tardation is obtained.

More specifically, the device embodying the invention is provided for the purpose of supplying a powerful driving force to a recorder and v opposing said driving force with a timing ele= ment to obtain a high precision movement o the record or recording element without overbanking, and to rewind or re-energize the timing element by the driving force.

Similar devices have been utilized in the prior art but such devices have been subject to serious diniculties. For example, upon the utilization oi a heavy weight or other powerful driving torce for driving a large number of recorder rollers or to drive the chart or other recording element at high speed, a serious overbanking of 'the clock retarding and timing mechanism has occurred. Such overbanking is highly injurious to the timing mechanism which is delicately constructed for high precision.

Further, upon attempting to vary the driving weight or force in order to reduce overbank ing, the variable effect of friction of the driving and other recording rollers was so marked that upon such reduction of the driving force or driving weight Ain order to reduce overbanking, an increase in the roll friction would stall the recorder driving mechanism.

Other devices, such as y-ball governors, have been utilized in an attempt to obtain high precision of control and to simultaneously eliminate overbanking. but such governors have not produced the necessary high precision required in certain types of paper or record travel.

1n view of the above conditions prevailing in the prior art, one of the objects of the present invention is to provide a novel record or paper travel control for a recorder, whereby the foregoing undesirable characteristics are eliminated.

Another object is to provide a, novel combination of a powerful driving weight or force and a high precision timing and retardng element, whereby the overbanking usually caused by a powerful driving force or weight is completely eliminated.

(Ci. Ztl- 2.4)

A further object is to provide a novel combination comprising a heavy driving weight or powerful driving torce for a paper feed mechanism, and means retarding the feed of said paper, said means comprising a double gear train clock system in- 5 cluding an escapement whereby the full force of the weight is modied before being transmitted to the escapement.

Still another object is to provide a novel paper feeding system including a heavy weight and a l@ timing k or retarding mechanism comprising a plurality of gear trains, an'escapement mechanism, and van actuating element, one of said trains modifying the force of said weight upon F said escapement and the other of said trains simultaneously retarding said paper feed and rewinding the actuating element of said timing mechanism.

A further object is to provide e. novel paper feeding mechanism including a heavy weight and e@ a timing or retarding mechanism comprising an escapement and a driving element, said esca ement and driving element being controlled by one train oi' gears and a second train of gears connected to said driving weight and said first gear train whereby timed retardation of said paper feed is obtained and said driving element is re= Wound by said driving weight.

The above and further objects and advantages of the invention will appear more fully hereinafter from a consideration of the detailed description which follows, taken togethenwith the accompanying drawings wherein two embodiments of the invention are illustrated. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only, and are notl designed as a dennition of the limits of the invention, reference being primarily had for this purpose to the appended claims. 40

In the drawings, wherein like reference characters refer to like parts throughout the several views:

Fig. 1 is ag developed sectional plan view of one embodiment of the invention, showing the 45 assembled construction of one form of the timing mechanism employed;

Fig. 2 is a schematic perspective view, with the parts of the mechanism rearranged ,to illustrate more clearly the coaction of the re- 50 spective parts of the novel timing mechanism shown in Fig. 1;

Fig. 3 is a sectional view of the driving element of the novel timing mechanism, taken on the line ,3-3 of Fig. 1

' it is to be expressly understood that the invention Fig. 4 is a'sectional view taken on the line 4 4 of Fig. 3 and rotated 90 degrees;

Fig. 5 is a schematic View illustrating the coac'tion between the gear trains illustrated in Fig. 1 and Fig. 2 and the control mechanism of the timing device;

Fig. 6v is a perspective view of a complete recorder and chart illustratng'the means for mounting and connecting the timing mechanism to the recording mechanism in accordance with the invention;

Fig. 7 is a partial perspective view of the recorder with the supply roll and chart removed, illustrating the coaction between the driving weight and the mechanism controlled by the timing device of the recording mechanism; and

Fig. 8 is a perspective view illustrating another embodiment of the control mechanism for the gear trains. v

Referring to the drawings, wherein like reference characters refer to like parts throughout the several views, and more particularly to Fig. 6. the novel combination-comprising the invention is illustrated, in the present instance, as applied is not to be so limited but may be appliedto any recording device. The timing or retarding element comprises a v'novel clock` mechanism which is designated generally as I 0, the casing II of which is fastened to recorder I2 by screws I3 cooperating with the -threaded holes' 13a in the base I4. A female clutch member I5 1s connected to the clock mechanism and is proy vided with openings I6 into which are fitted pins I1 on a male clutch member I8. Clutch member I8 is connected to a gear I9 meshing with gear 20 mounted on and driven by a shaft 2l carrying a roller 2 2 around which is wound a. cable 23, this cable being connected to the roller 22 at one end thereof, wound once completely around the expansion roller 22a and carrying at the other end thereof the driving weight 24 (see Fig. 7). Expansion roller 22a controls the rotation of the feed roll 25 integrally connected therewith. A supply roll 26 carries a chart26a cooperating with pen- 26h, the chart being passed downwardly from the top of supply roll 26, beneath feed roll 25, between the feed roll 25 and friction roll 25a over roll 25a to the take-up roll 25h, the supply roll and chartv being omitted in Fig. '1 in order to more clearly illustrate the coclock mechanism is shown as comprising the fe.

male clutch 'element I5 fastened to shaft 21 by collar 21a and screw 28. Connected to shaft 21 isa gear 29 meshing with pinion 38 on shaft 3| carrying gear 32. Pinion 33 meshing with gear 32 is integrally connected to the spring chamber or barrel 34 within which is mounted the helical spring 35 (see Fig. 3) fastened at one end thereof to a hub 36 integral with chamber 34 and connected to a pin 31 fastened to a gear 38 which is mounted for. free rotation about the shaft 39' journalled at its ends 39a and 39b in the plates i 48a and 481;, respectively. rChamber 34 is proon gear sa projects into the slot ai and abuts the ends 41a or IIb thereof at the limits of relative movement between the pin and slot.

Gear 38 meshes with pinion 43 (seel Fig. 2) onl 52, to raiseand lower the rod 5I once for each' revolution of the geary 48. Also carried by shaft 52 are the rods 53 and 54 Rod 53 is provided with a right angled portion 53a at the free end thereof cooperating witha rod 55 provided with a curved portion 55aat its free end and mountedfor rotation-with shaft 56 carrying al rod 51 provided at the free end thereof with a downwardly 4 extending right angled portion 51a. d

' Upon rotation of gear 48 as indicated by the arrow in Fig. 5, pin 48a abuts the rod 5I to lift the same and thereby rotate the shaft 52 whereby rod 53 is raised to elevatethe rod 55 to in turn rotate shaft 56 to lift the rod 51. A rod 58reciprocally mounted in a frame 59 is supplied with a finger-operable portion 68 at one end thereof and witha truncated conical shaft portion 6I at the other end thereof projectable over the end 54a of rod 54; When rod 58 is moved to the left as viewed in Fig. 5, a conical element 6I is moved into contact with portion 54a of rod 54 to depress the same and thereby rotate the shaft 52 manually in a clockwise direction. Rod 53 is thereby raised to elevate the rods 55 and 51 which releases the second gear train as will be described in detail later.,

Referring to Eig. 2, gear 29is shown as also the gear 64 meshing with pinion 85 integral with lshaft 66 carrying the gear 61 meshing with pinion 68 integral with shaft 69 carrying gear 18 meshing with pinion -1I integral with shaft 12 carrying the disc 13 which is supplied with a circumferential and radially extending slot 14. Also mounted on shaft 12 and carried thereby for rotation therewith, is gear 15 meshing with pinion 16 integral with shaft 1-1 carrying the gear 18 meshing with gear 19 integral with shaft 80 carrying the disc 8|. Disc 8l is provided with a pin 82 whose operation will be described in detail later in connection `with the control mechanism illustrated in Fig. 5. Extension 88a of shaft 88 carries a fan element 83 for retarding rotation of the second gear train.

Referring to Fig. 5, gear 48 is rotated at a constant speed under the control of the escapement mechanism 58, which speed may be chosen as one revolution per minute. Pin 48a rotatable with gear 48 abuts and raises the rod 5I during rotation of gear 48. When rod 5I is raised, Ashaft 52 is rotated clockwise to therebyelevate rods 53 and 54. Rod 54 is provided with a horizontal right angled portion 54u', a parallel portion .5412,

Simultaneous'elevation of rods 55-and 51.

neously lifts the downwardly extending portion 51a of rod 51 to avoid engagement with the side of the slot 14. The second gear train comprising gears 29, 62, 64, 85, 81, G8, 1D, and 1I is thereupon rotated through the force transmitted from the driving weight 24 acting through the shaft 2|, gear 20, gear I9, male clutch member I8, pins I1 inserted into the openings i6 of the female clutch member I5, hub 21a, pin 28 an shaft 21 attached to the gear 29.

The rotation of the various gears is, for the purpose of simplification, assumed to be as shown in Figs. 2 and 5.

As gear 48 continues to rotate, pin 48a, still being considered as in contact with rod 5|, the rod 54 continues in its raised position and thereby holdsy its vertical upwardly extending portion 54o in the path of rotation of pin 82 mounted on disc 8|. Just prior to completion of one complete rotation of disc 8 I, pin 82 abuts the vertical portion 54c of rod 54 and the rotation of the second gear train is momentarily stopped. This momentary stoppage together with the rotational friction produced by the fan element 83 slows the rod 5| whereby rod 5| is released allowing the shaft 52 to rotate counter-clockwise and thereby lower rods 53 and 54. When rod 54 is lowered,

its vertically extending portion 54e drops to the position as illustrated in Fig. 5 so that pin 82 is permitted to rotate past the portion 54e as long as the hooked end a of rod 55 is maintained in its raised position.

During the rst complete rotation of the disc 8|, rod 51 and its downwardly extending portion 51a are maintained in their elevated position whereby the slot 14 is permitted to advance beyond the end of the downwardly extending portion 51a. Upon the above described lowering of rod 53, which would ordinarily permit the rods 55 and 51 to assume the lower position, portion 51a of rod 51 rides upon the periphery of disc 13 and lthereby maintains rod 55 and hook .55a in elevated position for the duration of one complete rotation of the disc 13. The respective gear trains are so chosen that one-rotation of disc 13 permits rotation of gear 3,3 and chamber 34 an amount equal to one minute of rotation. The spring 35 therefore, is rewound by the action of weight 24 acting through the female clutch member I5 and gear train 29, 30, 32, and 33 and the housing 34 an amount equal to the unwinding of spring 35 during the previous interval of time, which has been chosen Ain the present instance as one minute. Spring 35 is therefore maintained at practically the same tension throughout the operation of the device, thereby insuring a constant driving force upon the gear 48 regardless of the length of time of operation and regardless of changes in the friction of the driving rollers. By maintaining the storing force of spring 35 at such constancy, the inherent precision of the device is continuously maintained at its highest point.

The strength of spring 35 with respect to the force of thedriving weight,y and the gear train and fan are chosen in accordance with the type of drive desired for the particular paper Leed. If intermittent operation of the paper feed is desired, the spring is chosen so as to be weak with respect to the driving weight. If a practically continuous feed is desired, the spring is made strong with respect to the driving weight, so that a large portion of the force of the driving weight is utilized in winding up the spring 35 instead of rapidly rotating the second gear train. Whether intermittent or continuous feed be utilized, the amount of feed per unit of time is maintained constant at a high precision due to the continuous rewinding of spring 35 and the uniform force thereby exerted by spring 35 upon gear 48 regardless of changes in friction in the rollers governing the paper feed.

It is to be noted that the force of the driving Weight is never exerted directly upon the escapement, since spring 35 at all times acts as a resilient buffer between the weight and the escapement, and that a portion of the energy supplied by the force of the driving weight is periodically stored in spring 35 while another portion is utilized to rotate the second gear train. Overbanking is thereby eliminated and a highly precise paper feed is simultaneously obtained at speeds of paper feed heretofore unattainable with great accuracy.

When the weight 24 has completely run down, the force on female clutch member I5 will be removed and the spring 35 will continue to drive the gear 38 until the pin 42 on gear 38 abuts the edge 4|b of slot 4|. At th1s time all rotation of. gear 48 ceasesbecause even with a remaining tension in the spring 35, none of the force of this tension can be relayed to the gear 48. When the weight 24 is rewound so that its force is again applied to the female clutch member I5, the linger-operated member is reciprocated to depress the end `54a of rod 54 thereby lifting the rod 53 to raise the rods 55 and 51 to thereby permit the second gear train torotate whereby the weight 24 acting on the first gear train 29 to 33 inclusive, rewinds the spring 35. The reciprocal memberv 60 is operated a sufficient number of times so that the pin 42 on gear 38 assumes a position midway between the ends 4|a and 4Ib of the slot 4I. The force of spring 35 is thereby again applied to the gear 48 and the device resumes operation. A

With the spring fully wound, as above described, the operation of the device will now be considered briey.

As pin 48a of gear 48 reaches rod 5|` it raises the latter upwardly together with rods 53, 54, 55 and 51, thereby disengaging hook 55a from pin B2 on disc 8| and lifting hook 51a. out of depres- ,sion 14 on disc 13, whereupon the second gear train is unlocked and permitted to be rotated by the descending weight for a relatively short interval and is momentarily stopped at the end of the rst revolution of disc 8| when -pin 82 strikes the upraised portion 54e of rod 54. This temporary stopping of disc 8| is to prevent the gear vNovel means-are thus provided whereby overbanking of the timing mechanism of a paper feed the second gear train is rotated by the Weightto move the record sheet a distance equal to one minute of travel. Also, during each cycle, the descending Weight rotates the first gear train to wind the spring 35 an amount equal to the amount unwound during one'revolution of gear ||8.l

The foregoing cycle of 'operation -is repeated every minute so that the springis continually beingrewound as the weight descends.

In Fig. 8 there is illustrated another embodi- A ment of the control structure shown in Fig. 5. The elements in Fig. 8, which perform substantially the same functions as the' elements in Figs. 2 and 5, are identified by primed -designations of the same reference numerals. It is to be noted by a comparison of Figs. 5 and 8 that the structure of Fig. 8 is a simplification of the structure'of the control mechanism of Fig. 5 'by the elimination of several parts.

Referring to Fig, 8, gear 48', instead of being provided with a pin as in the structure of gear Q8 of Fig. 5 has ashaft 5 0' formed with'a pair of notches 50a, and 50h located in the periphery thereof. .As gear 48' is rotated at constant speed, the notches 58a and 58h are alternately presented to thel pins lia and Mb, respectively, on cylinder '13', whereby a half revolution of cylinder i3 is permitted for each half revolution of gear 88' or, in other words, cylinder 13 is permitted to be rotated once per revolution of the gear 68 in .substantially the same manner that rotation of disc 13 of Fig.' 5 was permitted by gear 48 thereof. By increasing the number of notches, the rotation of cylinder 13 can be more nearly synchronized with that of gear 68' without permitting any transmission to the gear 48' of the force of rotation exerted on cylinder 73' by. the weight 2d. 'Ihe novel means as illustrated in Fig. 8 simplifies the structure of thedevice as illustrated in Fig. 5 and performs substantially the same function. It is to be noted, however, that element i3 rotates in the reverse direction @to the rotation of disc 13 of Fig. 5. Such rotation is readily provided .by the insertion of an idler gear as is well known in the art.

device is eliminated, high precision of control is obtained, and irregularities land stoppage of operation are prevented.

While only two embodiments of the invention have been illustrated and described, various changes and modifications in form, materials,

and relative arrangement of parts, which Awill now appear to those skilled in the art, may be the rst of said gear trains and said escapement,-

and means controlled by said escapement for controlling the rotation of said second gear train. Y

2. In a paper feed mechanism for a recorder or the like including a force-storing driving member and a retarding `timing' mechanism, the combination of a first train of motion transmitting mechanism, a second train of motion transmitting mechanism, an escapement, energy storing means between said rsttrain and said escapement, means controlled by said escapement for controlling the movement of said second train, and eans interconnecting said rst train and said second train whereby actuation of said second train actuates said rst train to restore the energy in said energy restoring means.

3. A paper feed timing mechanism comprising a clock, an escapement in said clock, a pair of gear trains,l means including a resilient storin-g member connecting one of said gear trains. to said escapement, a locking element in said second gear train, -a second locking element in said gear train, rotatable means controlled by -said escapement, means'controlled by said rotatable means and simultaneously releasing both of said locking elements, and means controlled by said rotatable means momentarily locking and Subsc- 5.In a paper feed timing mechanism, an,

escapement, a yrotatable element controlled by said escapement, a gear train, a pair of locking elements in said gear train, pivoted levers mounted for oscillation whereby said levers are actuated into engagement with and disengagement from said locking means, means on-sa-id rotatable element f or moving said levers in one direction whereby said locking elements are simultaneously released, means controlledby said rotatable element permitting actuation of said levers in the,

opposite direction, and means controlled by said rotatable element for momentarily stopping said gear train between the rst actuation of said levers and the reversal of direction of actuation thereof. v

6. In a paper feed timing mechanism, an escapement, a gear controlled by said. escapement, a. pin on said gear, a gear train, a pair of discs connected to said 'geafr train for actuation thereby, aslot in, oneof said discs, a-pin on the other of said discs, a -rotatable shaft, a lever on said shaft located in the path of movement of said gear-pin, a second rotatable shaft, a" first rod mounted on said shaft and engaging said disc pin, a second rod mounted. on said shaft andengaging said slot,-iand means controlled by 'rotation of said rst shaft for disengaging said rst and second rods whereby proportional vrotation of said second shaft is produced.

7, In a paper feed vtiming mechanism, an escapement, a gear. contro1led .by said escapemefnt, a pin on saidgear, a gear 'train, a/pair 'of discs connected to said gear train for rotation thereby, a slot in one ofsaid discs, a pin on the other of said discs, arotatable shaft, a vlever on said shaft located in the path of movement of said gear, a second rotatable shaft, a first rod mounted on said shaft and engaging said disc pin, a second rod mounted on said shaft and engaging said slot,l rod disengaging means controlled by rotation of said rst shaft for thereby producing proportional rotation of said second shaft, and finger-operable means for producing rotation of one of said shafts.

8. In a paper feed timing mechanism, an escapement, a gear controlled by said escapement, a pin onl said gear, a gear train, a pair of discs connected to said gear train for rotation thereby, a slot in one of said discs, a pin on the other of said discs, an oscillatable shaft, a lever on said shaft located in the path of movement of said gear pin, a second oscillatable shaft, a first rod mounted on sai( second shaft and engaging said disc pin, a second rod mounted on said shaft and engagirg said slot, means interconnecting said rst shaft and said second shaft, and a rod on said rst shaft oscillatable therewith and movable into and out of the path of movement of said disc pin.

9. In a paper feed timing mechanism, an escapement, a shaft controlled by said escapement, notches formed on the periphery of said shaft, a gear train, a rotatable member controlled by said gear train, and means on said member alternately aligning themselves with said notches and abutting said shaft,

10. In a paper feed mechanism, a control device comprising an escapement, a rotatable element controlled by said escapement, a gear train, a rotatable element controlled by said gear train,

staggered elements connected to one of said rotatable elements and staggered openings in the other of said elements, saidstaggered elements cooperating with said openings whereby said rotatable elements are intermittently relatively rotated. Y

11. A control mechanism comprising an escapement, a rotatable member controlled by said escapement, a second rotatable member, means exerting a rotative force on said second member. a` plurality of staggered notches in one of'said rotatable members, and a similar plurality of projecting elements on the other of said rotatable members, said elements extending into said notches uponalignment of 4said elements and notches and abutting said one member upon disalignment thereof.

12. In a. recorder having a record sheet to be 1 moved in accordance With time, time-controlled means comprising means for moving said sheet, a time-controlled suspended weight for actuating said sheet-moving means and adapted to be periodically dropped a predetermined distance after a predetermined interval of time to move said record sheet a predetermined distance equivalent to the distance which would be traversed during said interval of time at a predetermined rate, energy storing means, a rotatable element driven by said energy storing means, an escapement device for controlling the rotation of said rotatable element to maintain its speed constant and atY a predetermined rate, means controlled by said rotatable element for perodically releasing and locking said weight so that it drops after a predetermined interval of time as determined by the rate of rotation of said rotatable element and is locked after it has moved a predetermined distance, and means actuated by the dropping of said weight for storing energy in said energy storing means.

13. In a recorder having a record sheet to be moved in accordance with time, time-controlled means comprising means for moving said sheet, a time-controlled suspended weight for actuating said sheet-moving means and adapted to be periodically dropped a predetermined distance after a predetermined interval of time to move said record sheet a predetermined distance equivalent to the distance which would be traversed during said interval of time at a predetermined rate, energy storing means, a rotatable element driven by said energy storing means, an escapement device for controlling the rotation of said rotatable 'element to maintain its speed constant and at a predetermined rate, means controlled .by said rotatable element for periodically releasing and locking said weight so thatl it drops after a predetermined interval of time as determined by the rotation of said rotatable element and is locked after it has moved a predetermined distance, means actuated by the dropping of said Weight for storing energy in said energy storing means, and manually actuated means for actuating said weight releasing and locking means to initially store energy in said energy storing means.

14. In a recorder having a record sheet to be moved in accordance with time, time-controlled means comprising means for moving said sheet, a time-controlled suspended weight for actuating said sheet-moving means and adapted to be periodically dropped a predetermined distance after a predetermined interval of time to move said record sheet a predetermined distance equivalent to the distance which would be traversed during said interval of time at a predetermined rate, a spring wound motor, a rotatable element driven by said spring wound motor, an escapement device for controlling the rotation of said rotatable element to maintain its speed constant and at a predetermined rate, means controlled by said rotatable element for periodically releasing and locking said Weight so that it drops after a predetermined interval of time as determined by the rate of rotation of said rotatable element and is locked after it has moved a predetermined distance, and means actuated by the dropping of said weight for storing energy in said spring Wound motor.

15. In a recorder having a record sheet to be Imoved in accordance with time, time-controlled means comprising means for moving said sheet, `la time-controlled suspended Weight for actuating said sheet-moving means and adapted to be periodically dropped a predetermined distance after a predetermined interval of timeto move said record sheet a predetermined distance equivalent to the distance which would be traversed during a spring wound motor, a rotatable element driven by said spring wound motor, an escapement device for controlling the rotation of said rotatable element to maintain its speed constant and at a predetermined rate, means controlled by said rotatable element for periodically releasing and locking said weightso that itdrops after apredetermined interval of time as determined by the vrate of rotation of said rotatable element and is locked after it has moved a predetermined distance, means actuated by the dropping of said weight for storing energy in said spring wound motor, and manually actuated means for actuating said weight releasing and locking means to initially store energy in said spring wound motor.

RALPH R. CHAPPELL.

RUTGER B. COLT.

'said interval of time at a predetermined rate, 

